Do hide (optionally discarding) tabs when snoozing instead of closing

[brunoais]

For some tabs, there's interest in keeping its state. Closing such tabs can be annoying.
Useful things to keep are elements such as scroll distance, form fields already filled (an HTML form partially filled).
This is specially useful for websites which work like SPAs and, while clicking around, don't update the URL or they do update the URL but it doesn't work when loading back to it.
I do understand different people would want different operations, given that, I think this can be solved with a new option when making a snooze.

I am aware that pined tabs cannot be hidden, for instance. For those, just unpin them first before hiding and then pin them back again when unhiding. Do notice that pin tab order may be important to the user.

Opinions please.

[bwinton]

Ooh, interesting idea… We probably wouldn't want to store the set of hidden tabs in bookmarks if we did that, which means it's a bit of an architecture change, but it seems like a good idea.

Currently, when we awaken a pinned tab, it wakes up unpinned, so I'd probably just keep that behaviour.